What is CVE-2019-3563?

CVE-2019-3563 is a critical-severity vulnerability in Facebook Wangle, classified under Buffer Over-read. CVSS score: 9.8/10. Published 2019-04-29.

How severe is CVE-2019-3563?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Facebook Wangle

CVE-2019-3563

Wangle's LineBasedFrameDecoder contains logic for identifying newlines which incorrectly advances a buffer, leading to a potential underflow. This affects versions of Wangle prior to v2019.04.22.00

Published 2019-04-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.5th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Facebook Wangle — versions v2019.04.22.00, unspecified

Weakness classification (CWE)

References

github.com/facebook/wangle/commit/5b3bceca875e4ea4ed9d14c20b20ce46c92c13c6 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2019-3563?: CVE-2019-3563 is a critical-severity vulnerability in Facebook Wangle, classified under Buffer Over-read. CVSS score: 9.8/10. Published 2019-04-29.
How severe is CVE-2019-3563?: Critical severity. CVSS v3 base score is 9.8 out of 10.